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Step 56 Idle Adjustment Screw & Carburetor Spring
The idle adjustment screw is used to limit the travel of the throttle
valve inside the carburetor. Turn the adjustment screw until the point
is flush to the bottom of the rotary lever, this will be the throttle stop
position. The spring is already installed on the carburetor and should
be left in place. The spring provides the necessary tension along the
length of the throttle lever axle to prevent wearing of the shaft prema-
turely. Install the carburetor to the engine crankcase using the screws
and gaskets included with the engine with the primer bubble facing
rearward and the fuel fittings on top.
Step 57 Throttle Pushrod & Carburetor Arm
Before the carburetor arm is tightened to the to the carburetor throttle shaft, the pushrod will be attached and adjusted to
achieve a linear geometry that will result in a 90
carburetor arm. Install one steel ball into the carburetor arm positioned in the center hole (13.5mm from the center of the arm)
and the servo horn at 13.5mm, using L242 Blue threadlock. If you have not already done so, shorten the throttle pushrod from
104mm to 94mm by cutting 5mm off each end. Install the ball links and set pushrod F to 112mm center to center. Move the
collective stick to the center and press the servo horn onto the servo close to the final angle. Slide the carburetor arm over
the throttle lever shaft and attach Pushrod F. Using the subtrim on the throttle channel, fine tune the servo horn to achieve the
90
degree setting. Looking through the venturi, move the valve to the 45
0
on the side of the carburetor arm. Check the end points and continue to adjust the set screw postion until the carburetor will
move through the entire throttle range with out binding. Once complete, firmly hold the external throttle lever, remove and
apply L242 Blue threadlock to the M3x4 set screw and tighten in place.
Optional
#CNLR1018 Ultra
#CN2288 Metal
Short Steel Ball &
Servo Arm Pack
M2 Hex Nut
Step 58 Fuel Lines
Of the three lines to the fuel tank, both the primer
return line and the atmosphere line can use the 1/8"
ID fuel line. The fuel pickup line on the Z231H en-
gine should use the same 1/8" ID fuel line but use the
larger 3/16" ID fuel line on the Z260H engine. The
atmosphere line should run from the top of the fuel
tank, upward and looped near the top of the vertical
frame and then routed and tied to one of the landing
gear spacers, making sure that the fuel line extends
1/4" past the plastic struts.
24
degree angle between the pushrod and both the servo horn and the machined
0
90
Degrees
0
#HW6192C
Pushrod F 112mm
(center to center)
Idle Screw, position flush to
bottom of throttle lever.
position and lightly tighten the M3x4 set screw
0
90
Degrees
0
#CNLR1018 Ultra
Short Steel Ball &
M2 Hex Nut
Primer Return Line
Tygon fuel line
Fuel Pickup Line
not included.
#HW6192B Car-
buretor Arm &
M3x4 Set Screw
Atmosphere
Line
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